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$128+ Cheap flights from St. Louis (STL) to Mexico

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MEX
Nov 30 — Dec 71
Sun 11/30
Sun 12/7
1 adult, Economy
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Find flight deals from St. Louis to Mexico

Cheapest flights from St. Louis to Mexico
Explore the most affordable flight options available from St. Louis to Mexico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:00 amSTL - CUN
Nonstop3h 23mFrontier
Sat 12/1311:28 amCUN - STL
Nonstop3h 22mFrontier
Deal found 10/30$274
This Frontier deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:00 amSTL - CUN
Nonstop3h 23mFrontier
Sat 12/611:28 amCUN - STL
Nonstop3h 22mFrontier
Deal found 10/29$299
This Priceline deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/91:59 pmSTL - CUN
1 stop6h 21mMultiple Airlines
Sat 12/1311:28 amCUN - STL
Nonstop3h 22mMultiple Airlines
Deal found 10/30$313
This Frontier deal was found by Cheapflights users on 10/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:00 amSTL - CUN
Nonstop3h 23mFrontier
Fri 12/1912:26 pmCUN - STL
Nonstop3h 21mFrontier
Deal found 10/31$321
This Frontier deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:00 amSTL - CUN
Nonstop3h 23mFrontier
Tue 12/911:28 amCUN - STL
Nonstop3h 22mFrontier
Deal found 10/30$322
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/296:15 amSTL - CUN
Nonstop3h 18mFrontier
Sat 12/611:28 amCUN - STL
Nonstop3h 22mFrontier
Deal found 10/30$326
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/79:30 amSTL - CUN
1 stop10h 50mDelta
Fri 12/128:44 amCUN - STL
2 stops13h 18mDelta
Deal found 10/29$330
This Frontier deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:00 amSTL - CUN
Nonstop3h 23mFrontier
Mon 12/811:28 amCUN - STL
Nonstop3h 22mFrontier
Deal found 10/29$336
This Priceline deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/64:05 pmSTL - CUN
1 stop28h 10mMultiple Airlines
Sat 12/1311:28 amCUN - STL
Nonstop3h 22mMultiple Airlines
Deal found 10/30$339
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:30 pmSTL - MEX
2 stops30h 30mMultiple Airlines
Tue 12/98:10 amMEX - STL
1 stop26h 04mMultiple Airlines
Deal found 10/30$421
This flugladen.de deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/64:05 pmSTL - PVR
1 stop21h 25mAir Canada
Fri 12/122:35 pmPVR - STL
1 stop24h 54mAir Canada
Deal found 10/29$429
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/810:47 amSTL - MEX
2 stops35h 13mMultiple Airlines
Fri 12/1210:20 pmMEX - STL
1 stop15h 30mMultiple Airlines
Deal found 10/30$433

Cheap flight deals from St. Louis to Mexico

Keep the following information in mind while searching for St. Louis to Mexico flight deals. Data was last updated October 31, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$274
(Kiwi.com)

One-way from

$128
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$679

Good round-trip deal

$361 or less

Good one-way deal

$192 or less
Provider with most accurate pricing for Lambert-St Louis-Mexico City Benito Juarez flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Mexico City Benito Juarez flights.
Search Deals
From Lambert-St Louis to Mexico
Search Deals
One-way flight from Lambert-St Louis to Mexico
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($56 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Mexico.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Mexico.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Mexico that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 31, 2025.
Use the filters below to find and compare flights from St. Louis to Mexico that are best for you.

Fly from

St. Louis

Fly to

Mexico

Route

Depart

Return

Price

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Wed 1/21

7:10 am-8:00 pm

2 stops11h 50m

Cancun

Wed 1/28

3:13 pm-11:39 pm

1 stop9h 26m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 12/7

9:30 am-9:20 pm

1 stop10h 50m

Cancun

Fri 12/12

12:00 pm-5:56 pm

1 stop6h 56m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Tue 2/24

6:30 am-6:47 pm

2 stops11h 17m

Cancun

Fri 2/27

8:00 am-6:04 pm

1 stop11h 04m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Mon 12/8

6:00 am-3:33 pm

1 stop8h 33m

Cancun

Tue 12/16

8:00 am-6:33 pm

1 stop11h 33m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Mon 2/23

6:30 am-3:15 pm

1 stop7h 45m

Cancun

Thu 2/26

5:30 pm-11:40 pm

1 stop7h 10m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 2/1

6:00 am-3:30 pm

1 stop8h 30m

Cancun

Tue 2/10

1:33 pm-11:39 pm

2 stops11h 06m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Sun 2/1

6:00 am-8:00 pm

2 stops13h 00m

Cancun

Thu 2/5

8:38 am-8:39 pm

2 stops13h 01m

$330

St. LouisCancún

STL - CUN

STLCUN

Lambert-St Louis

Mon 2/2

9:59 am-9:11 pm

1 stop10h 12m

Cancun

Fri 2/6

12:05 pm-11:25 pm

2 stops12h 20m

$335

St. LouisSan José del Cabo

STL - SJD

STLSJD

Lambert-St Louis

Wed 1/21

2:38 pm-3:35 pm

1 stop25h 57m

San José del Cabo Los Cabos

Sun 1/25

8:00 am-2:47 pm

1 stop5h 47m

$414

St. LouisMexico City

STL - MEX

STLMEX

Lambert-St Louis

Mon 12/8

10:47 am-10:00 pm

2 stops35h 13m

Mexico City Benito Juarez

Fri 12/12

10:20 pm-1:50 pm

1 stop15h 30m

$433

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/31

Showing 1-10 of 60 results
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Best time to book a flight from St. Louis to Mexico

Have a flexible travel schedule? Discover the best time to fly to Mexico from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Mexico

What is the cheapest month to book a flight from St. Louis to Mexico?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Mexico (average of $172). Flying from St. Louis to Mexico in December is currently the most expensive (average of $301). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to MX?

Find hourly flight availability from St. Louis to Mexico. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 31, 2025.

When flying from St. Louis to Mexico, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 16% versus a flight at noon.

What is the cheapest day to fly from St. Louis to Mexico?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Mexico. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Mexico flight should consider departing on Sunday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Mexico

Get insights into the airlines that provide service to Mexico. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Mexico. Reviews last updated October 31, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and American Airlines from St. Louis to Mexico. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,996 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,034 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Volaris
6.7
Okay
1,151 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,123 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Mexico. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Mexico?

    Lambert-St Louis (STL), located 12.7 mi from the city center, is the airport you fly out of when you book flights from St. Louis to Mexico.

  • How long is the flight from St. Louis to Mexico?

    Delta, Aeromexico, and Frontier can get you from St. Louis to Mexico in just under 7h 50m. Your travel time can differ by up to 4h. The distance between St. Louis and Mexico is about 1276 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from St. Louis to Mexico one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $149. Users have also found prices from $151 and $151 on United Airlines and Delta, respectively.

  • What are the most popular routes from St. Louis to Mexico?

    The most popular route from St. Louis to Mexico is Lambert-St Louis - Cancun. You may also consider Lambert-St Louis - Cozumel or Lambert-St Louis - Puerto Vallarta Ordaz.

  • Can I find deals for flights from St. Louis to Mexico that include hotel bookings?

    Yes. In addition to deals on St. Louis to Mexico flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Mexico?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Mexico.

  • Can I find deals for business class flights from St. Louis to Mexico?

    Yes. Cheapflights offers flight deals from St. Louis to Mexico by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Mexico?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Mexico (average of $172). Flying from St. Louis to Mexico in December is currently the most expensive (average of $301). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for St. Louis to Mexico

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from St. Louis to Mexico

Discover the top 9 airlines that operate flights from St. Louis to Mexico. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$130Average$293FlexibilityNo cancel feeOn-time65%
VolarisCheapest$175Average$374FlexibilityNo cancel feeOn-time79%
DeltaCheapest$218Average$586FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$243Average$463FlexibilityNo cancel feeOn-time62%
AeromexicoCheapest$252Average$539FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$306Average$577FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$418Average$622FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$453Average$671FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$492Average$635FlexibilityNo cancel feeOn-time75%

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